WEST CORP

CUSIP: 952355204 Class: COM

MARSHALL WACE, LLP's Holding History (CIK: 0001318757)

Note: Option positions (PUT/CALL) are excluded.

Q2 2015
Shares 240,815 Value ($000) $7,249 Avg Close — Range —
Q1 2015
Shares 278,752 Value ($000) $9,402 Avg Close — Range —